Method and apparatus for wrist arthroplasty

ABSTRACT

A prosthetic wrist having at least one of a radial insert, which is configured to be fixed to a radius of a patient, a carpal implant and a wrist bearing component. The carpal implant includes a body and a pair of flanges, each of which being skewed to the axis of the body in a manner that permits them to abut the ulnar side of the hamate bone and the radial side of the distal portion of the carpal bone complex, respectively. The radial insert may be provided with a plurality of modular portions to allow for selection and customization of an implant.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent application Ser. No. 10/279,240 filed on Oct. 24, 2002, which is now U.S. Pat. No. 6,746,486 issued on Jun. 8, 2004. The disclosure of the above application is incorporated herein by reference.

FIELD

The present invention generally relates to prosthetic implants and more particularly to a prosthetic wrist implants.

BACKGROUND

With reference to FIG. 1 of the drawings, the dorsal side of the bone structure of a patient's left hand and wrist is illustrated in conjunction with the radius 2 and the ulna 4. The bone structure includes a carpal bone complex 6 having a scaphoid 8, a lunate 10, a triquetrum 12, a pisiform 14, a trapezium 16, a trapezoid 18, a capitate 20 and a hamate 22. It will be appreciated that the scaphoid 8 and the lunate 10 bones articulate with the radius 2 during the movement of the wrist.

In a variety of wrist disorders, patients may experience discomfort, pain and difficulty in moving the wrist. Prior surgical treatment of this condition involved fusion to inhibit movement of the scaphoid 8 and the lunate 10 bones relative to the radius to thereby alleviate pain in the patient's wrist. This procedure, however, leaves the patient without motion in their wrist and thereby severely restricts the use of their wrist. Prosthetic wrist implants have been developed to provide a pair of artificial bearing surfaces for the wrist. Several of the prior wrist implants have suffered from drawbacks including limited range of motion and excessive bone resection. Others still provide proper motion only when aligned in an extremely precise manner relative to the carpal bone complex 6. While various jigs and fixtures may be employed to aid in the locating and forming of a hole in the distal portion of the carpal bone complex 6 for receiving a carpal implant, these devices typically do not completely eliminate the possibility of error in the alignment and forming of the hole.

Accordingly, there remains a need in the art for an improved prosthetic wrist implant that provides improved support and strength for the distal portion of the carpal bone complex 6 and which has a bearing surface whose orientation is changeable after implantation to provide the implanted prosthetic wrist with a range of motion that mimics the range of motion of a natural wrist.

SUMMARY

An implant for a wrist arthroplasty, such as a total or hemi-arthroplasty, are disclosed. Various embodiments include providing a hemi-arthroplasty included for either replacing the distal portions of the radius, ulna or both to articulate with natural portions of the carpal bone complex. Also, a hemi-arthroplasty that includes replacing portions of only the carpal bone complex. Alternatively, an arthroplasty may occur regarding the radius or ulna bones and the carpal bones to provide a substantially complete wrist arthroplasty. In addition, both the carpal bone complex prosthetic and the radius and ulna prosthetic may include substantially modular portions such that selections may be made during an operative procedure to assist in providing a substantially best fit or customized implant for a selected patient. In addition, various portions of the prosthetic may include parts to replace complete bones of the carpal bone complex or other anatomical portions to assist in providing a substantially natural articulation and range of motion of the wrist after the procedure.

According to various embodiments, a modular prosthetic for placement in a wrist relative to a radius is disclosed. A distal radial assembly may include a stem portion operable to be positioned relative to a portion of the radius and a distal radial segment operable to be interconnected with the stem portion during an operative procedure. The stem portion and the distal radial segment are provided to be interconnected to substantially form a portion of a radial articulation with a carpal complex.

According to various embodiments, a modular prosthetic for placement in a wrist is disclosed. A distal radial assembly including a stem portion operable to be positioned within a portion of a radius and a distal radial segment operable to be interconnected with the stem portion during an operative procedure. The modular prosthetic may also include a carpal implant operable to be interconnected with a portion of the wrist to articulate with the distal radial implant. The stem portion and the distal radial segment are provided to be interconnected to substantially form a portion of a radial articulation with a carpal complex.

According to various embodiments, a kit for performing an arthroplasty relative to the wrist joint including the radius and the carpal complex is disclosed. A stem member operable to be positioned relative to the radius having a stem connection portion may be provided. A distal radial segment may also be included having a segment connecting portion operable to be associated with the stem member. A carpal implant may be provided to be associated with the carpal complex. Also, a bearing member may be disposable between the distal radial segment and the carpal complex implant. At least two of the stem member, the distal radial segment, the carpal complex implant; and the bearing member are associated to perform the arthroplasty.

According to various embodiments a method of performing a wrist arthroplasty relative to a radius and a carpal complex. The method includes forming an incision relative to the wrist and determining an arthroplasty to be performed for the wrist arthroplasty. Also a stem member and a distal radial segment may be selected. The selected stem member and the distal radial segment may be interconnected. Each of the members may be positioned in the anatomy and the stem member may be positioned relative to the radius.

Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the various embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Additional advantages and features of the present invention will become apparent from the subsequent description and the appended claims, taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a view of the dorsal side of a patient's left hand and wrist illustrating the bone structure of the hand and wrist in conjunction with the radius and the ulna;

FIG. 2 is a view of the dorsal side of a patient's left hand and wrist illustrating the implantation of a prosthetic wrist implant constructed in accordance with the teachings of the present invention;

FIG. 3 is an exploded view of a prosthetic wrist constructed in accordance with the teachings of the present invention;

FIG. 4 is a perspective view of a portion of the prosthetic wrist of FIG. 2 illustrating the carpal implant in greater detail;

FIG. 5 is a side view of a portion of the prosthetic wrist of FIG. 2 illustrating the wrist bearing component in the coronal plane;

FIG. 6 is a side view of a portion of the prosthetic wrist of FIG. 2 illustrating the wrist bearing component in the sagittal plane;

FIG. 7 is an exploded perspective view of a prosthetic wrist similar to that of FIG. 2 but additionally including an alignment mechanism for radially fixing the wrist bearing component relative to the carpal implant;

FIG. 8 is an exploded view in partial section of a prosthetic wrist constructed in accordance with the teachings of a second embodiment of the present invention;

FIG. 9 is a view of a kit that utilizes the prosthetic wrist of FIG. 8;

FIG. 10 is a side elevation view of a carpal implant constructed in accordance with the teachings of a third embodiment of the present invention;

FIG. 11 is a side elevation view of a carpal implant constructed in accordance with the teachings of a fourth embodiment of the present invention;

FIG. 12 is a side elevation view of a carpal implant constructed in accordance with the teachings of a fifth embodiment of the present invention;

FIG. 13 is an exploded front elevation view of a portion of a prosthetic wrist constructed in accordance with the teachings of a sixth embodiment of the present invention;

FIG. 14 is a side elevation view of a portion of the prosthetic wrist of FIG. 13;

FIG. 15 is an exploded side elevation view of a prosthetic wrist constructed in accordance with the teachings of a seventh embodiment of the present invention;

FIG. 16 is an exploded side elevation view of a prosthetic wrist constructed in accordance with the teachings of an eighth embodiment of the present invention;

FIG. 17 is an exploded perspective view of a prosthetic wrist constructed in accordance with the teachings of a ninth embodiment of the present invention;

FIG. 18 is an exploded side elevation view of the prosthetic wrist of FIG. 17;

FIG. 19 is an exploded perspective view of a prosthetic wrist constructed in accordance with the teachings of a tenth embodiment of the present invention;

FIG. 20 is an exploded side elevation view of the prosthetic wrist of FIG. 19;

FIG. 21 is an exploded perspective view of a prosthetic wrist constructed in accordance with the teachings of an eleventh embodiment of the present invention;

FIG. 22 is an exploded side elevation view of the prosthetic wrist of FIG. 21;

FIG. 21A is an exploded perspective view of a prosthetic wrist constructed in accordance with the teachings of various embodiments of the present invention;

FIG. 22A is an exploded side elevation view of the prosthetic wrist of FIG. 21A;

FIG. 23 is an exploded side elevation view of a prosthetic wrist constructed in accordance with the teachings of a twelfth embodiment of the present invention;

FIG. 24 is an exploded side elevation view of a prosthetic wrist constructed in accordance with the teachings of a thirteenth embodiment of the present invention;

FIG. 25 is a sectional view taken along the line 25-25 of FIG. 24;

FIG. 26 is an exploded side elevation view of a prosthetic wrist constructed in accordance with the teachings of a fourteenth embodiment of the present invention; and

FIG. 27 is a sectional view taken along the line 27-27 of FIG. 26.

FIG. 28 is a posterior to anterior view of the carpal complex;

FIG. 29A is a plan view of a carpal implant according to various embodiments;

FIG. 29B is a plan view of a carpal implant according to various embodiments;

FIG. 30 is a plan view of a carpal implant according to various embodiments;

FIG. 31 is an environmental view of the carpal implant according to various embodiments of FIG. 30 implanted;

FIG. 32 is a distal radial implant according to various embodiments;

FIG. 33 is a stem portion of a distal radial implant according to various embodiments;

FIG. 34A is a plan view of a distal radial segment of a modular distal radial implant according to various embodiments;

FIG. 34B is a perspective view of the distal radial segment of FIG. 34A;

FIG. 35A is a plan view of distal radial segment for a distal radial implant according to various embodiments;

FIG. 35B is a perspective view of the distal radial segment of FIG. 35A;

FIG. 36A is a plan view of a distal radial segment implant according to various embodiments;

FIG. 36B is a perspective view of the distal radial implant of FIG. 36A;

FIG. 37 is an environmental view of the distal radial implant of FIG. 36A in an implanted position;

FIG. 38A is a distal radial segment of the distal radial implant according to various embodiments;

FIG. 38B is a perspective view of the distal radial segment of FIG. 38A;

FIG. 39A is a plan view of a bearing portion for a distal radial segment according to various embodiments;

FIG. 39B is a perspective view of the bearing portion of FIG. 39A according to various embodiments;

FIG. 40A is a plan view of a bearing portion for a distal radial implant according to various embodiments;

FIG. 40B is a perspective view of the bearing portion of FIG. 40A;

FIG. 41 is a perspective view of a distal radial implant according to various embodiments;

FIG. 42 is a perspective view of a distal radial implant according to various embodiments;

FIG. 43 is an environmental view of the distal radial implant of FIG. 42 according to various embodiments in an implanted position; and

FIG. 44 is a kit view of various embodiments of the present invention.

FIG. 45 is an environmental view of a carpal implant in a hemi-arthroplasty implantation.

DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS

The following description of various embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

With reference to FIGS. 2 and 3 of the drawings, a prosthetic wrist constructed in accordance with the teachings of the present invention is generally indicated by reference numeral 50. The prosthetic wrist 50 is illustrated in a post operative condition as implanted to a distal portion 2 a of the radius 2 and a distal portion 6 a of the carpal bone complex 6. As those skilled in the art will appreciate, the distal portion 2 a of the radius 2 and the distal portion 6 a of the carpal bone complex 6 are formed when the surgeon resects a portion of the radius 2 and the carpal bone complex 6 from the patient prior to implantation of the prosthetic wrist 50.

The prosthetic wrist is illustrated to include a radial implant 52, a carpal implant 54, a wrist bearing component 56 and a plurality of bone screws 58. The radial implant 52 includes a radial stem 60, which is configured to be implanted into a distal portion 2 a of the radius 2, and a bearing guide 62, which is fixed to the distal end of the radial stem 60. The bearing guide 62 includes a bearing or concave guide surface 64 that is configured to engage in a mating manner the wrist bearing component 56. In the preferred embodiment, the radial implant 52 is unitarily formed from a titanium material, such as Ti-6Al-4V (F136), although those skilled in the art will understand that other materials having sufficient strength and biocompatibility may also be employed. Those skilled in the art will also understand that the radial implant 52 may be configured in a modular manner, wherein the radial stem 60 and the bearing guide 62 are discrete elements that are coupled together prior to or during the process of implantation. It will also be understood that the bearing guide 62 may be integrally formed or molded onto the radial implant 52 and formed of a selected material. For example, the bearing guide 62 may be formed of a polyethylene material or other polymer to be formed with the radial stem 60. Therefore the radial implant 52 may include a proximal radial stem on a distal radial portion over which the bearing guide portion 62 is formed. Nevertheless, as discussed above, the bearing guide portion 62 may be formed of any appropriate material such as a ceramic, or a metal including titanium and cobalt chromium molybdenum alloy.

With additional reference to FIGS. 3 and 4, the carpal implant 54 is illustrated to include a body 70, a ulnar flange 72 and a radial flange 74. The carpal implant 54 is unitarily formed from a titanium material, such as Ti-6Al-4V (F136), although those skilled in the art will understand that other materials having sufficient strength and biocompatibility may also be employed.

The body 70 includes a stem 80, a proximal stem 82 and an interconnecting flange 84. The stem 80, which is formed along a stem axis 86 and extends from the distal side of the body 70, is configured to be inserted into a hole formed in the capitate 20 (FIG. 2). The proximal stem 82 extends in a direction opposite the stem 80 and is sized to engage the wrist bearing component 56. In the particular embodiment illustrated, the proximal stem 82 is formed as a tapered cylinder having an axis 88 that is offset ulnarly from the stem axis 86. Those skilled in the art will appreciate, however, that the axis 88 of the proximal stem 82 may be coincident with the stem axis 86. The taper of the proximal stem 82 is configured to the profile of a conventional Morse taper for attachment to the wrist bearing component 56. A fillet radius R is employed to reduce the concentration of stress at the points at which the stem 80 and the proximal stem 82 are joined to the remainder of the body 70.

The interconnecting flange 84 couples the stem 80 to the ulnar flange 72. The interconnecting flange 84 includes an interconnecting bone abutment surface 90 that is skewed to the stem axis 86 by an angle that is less than 90 degrees in magnitude and which is preferably about 80 degrees to permit the interconnecting flange 84 to conform to the proximal end of the distal portion 6 a of the carpal bone complex 6.

The ulnar flange 72 is coupled to a side of the interconnecting flange 84 proximate the stem 80 and has a lateral bone abutment surface 96 that is configured to abut an ulnar side of the hamate 22 and which projects upwardly from the body 70 in a manner that is skewed to both the stem axis 86 and the interconnecting bone abutment surface 90 by an angle of less than 90 degrees. A securing aperture 98 a, which is formed in the distal end of the ulnar flange 72 along an axis that is generally perpendicular to the lateral bone abutment surface 96, is illustrated to include a first portion 100 and a second portion 102. The first portion 100 of the securing aperture 98 a has a spherical shape that is configured to matingly engage the frusto-conical surface of the head 58 a of a bone screw 58. (FIG. 3). The second portion 102 of the securing aperture 98 a has a generally cylindrical shape that is sized to receive the body 58 b of the bone screw 58.

In the particular embodiment illustrated, the ulnar bone abutment surface 96 is arranged at an angle of about 50 degrees relative to the stem axis 86. The distal end of the ulnar flange 72 terminates at an arcuate edge 104 that is defined by a radius that is centered at the centerpoint of the securing aperture 98 a. As those skilled in the art will readily appreciate, however, the center of the radius need not be centered at the centerpoint of the securing aperture 98 a.

The radial flange 74 is coupled to the body 70, and more specifically to the interconnecting flange 84, on a side opposite the ulnar flange 72 and includes a medial bone abutment surface 110 that is configured to abut a radial side of the distal portion 6 a of the carpal bone complex 6 and which projects upwardly from the body 70 in a manner that is skewed to the stem axis 86 by an angle of less than 90 degrees. In the particular embodiment illustrated, the radial bone abutment surface 110 is skewed to the stem axis 86 by an angle of about 80 degrees. Like the ulnar flange 72, the radial flange 74 includes a securing aperture 98 b and terminates at its distal end at an arcuate edge 112 that is defined by a radius that is centered at the centerpoint of the securing aperture 98 b. The securing aperture 98 b is substantially identical to the securing aperture 98 a but is formed about an axis that is generally perpendicular to the radial bone abutment surface 110.

In view of the above discussion, those skilled in the art will appreciate that one general concept of the present invention is the provision of a carpal implant having radial and ulnar flanges that are configured to abut portions of the carpal bone complex (whether resected or not) in a way that supports the bones of the radial and ulnar sides of the carpal bone complex. Accordingly, those skilled in the art will appreciate that the carpal implant of the present invention may be formed in any generally concave manner (i.e., wherein at least a portion of each of the radial and ulnar flanges is skewed to the axis of the body) that is configured to abut the radial and ulnar sides of the carpal bone complex (whether resected or not). Other examples of the “concave” formation of the carpal implant of the present invention are illustrated in FIGS. 10 through 12 and 15 through 27 and will be described in detail below.

With renewed reference to FIGS. 2 and 3 and additional reference to FIGS. 5 and 6, the wrist bearing component 56 has the general shape of an ellipsoidal segment and includes a generally flat abutting edge 120 and a wrist bearing surface 122. As those skilled in the art will appreciate, the wrist bearing surface 122 does not extend to a point where it intersects the abutting edge 120 as this would cause the wrist bearing component 56 to be too large in size. Accordingly, the flat sides at which the wrist bearing surface 122 terminates permit the wrist bearing surface 122 to be shaped in a desired manner while maintaining proper sizing of the wrist bearing component 56. A securing feature 124 is formed into or otherwise coupled to the abutting edge 120 to permit the wrist bearing component 56 to be secured to the proximal end of the carpal implant 54. In the particular example provided, the securing feature 124 is a blind tapered hole that is configured to matingly engage the proximal stem 82. Those skilled in the art will readily understand, however, that any appropriate coupling means may be employed to couple the wrist bearing component 56 to the carpal implant 54 and as such, the scope of the present invention will not be so limited as to require the coupling of the wrist bearing component 56 and the carpal implant 54 through the engagement of a tapered stem with a tapered hole. As those skilled in the art will appreciate, the modular nature of the wrist bearing component 56 permits the surgeon to select from a variety of wrist bearing components 56 that are differently sized and/or shaped to permit the surgeon to tailor the prosthetic wrist 50 to the individual needs of the patient. Those skilled in the art will also appreciate that the surgeon's selection of a particular wrist bearing component 56 may necessitate the use of a particular radial implant 52 that has a correspondingly different size and/or configuration.

The wrist bearing component 56 is preferably formed from a cobalt chromium alloy, such as CoCrMo, which provides fatigue and corrosion resistance, as well as a relatively high degree of strength. Those skilled in the art will understand that other appropriate materials, including metals and/or plastics, may alternatively be employed to form the wrist bearing component 56 or a portion thereof which includes the wrist bearing surface 122.

With particular reference to FIGS. 5 and 6, the wrist bearing surface 122 is illustrated as being defined by a first radius 130 in the coronal plane and a second radius 132 in the sagittal plane. Preferably, the first and second radii 130 and 132 are different and more preferably, the first radius 130 is larger than the second radius 132. Configuration of the wrist bearing component 56 in this manner permits the prosthetic wrist 50 to move in a manner that more closely approximates the motion of a natural wrist.

In situations where the wrist bearing surface 122 is contoured in a manner that is not defined by a single spherical radius, the orientation of the wrist bearing component 56 relative to the radial implant 52 is critical. Accordingly, the prosthetic wrist 50 preferably also includes an alignment mechanism 150 in such situations for radially fixing the wrist bearing component 56 relative to the carpal implant 54 as is illustrated in FIG. 7. Preferably, the alignment mechanism 150 permits the surgeon implanting the prosthetic wrist 50 to orient the wrist bearing surface 122 to a predetermined installation orientation that is dependent upon the orientation between the implanted carpal implant 54 and the implanted radial implant 52. For example, if the radial implant 52 were to be fixed to the distal portion 2 a of the radius 2 in a manner that was rotated slightly from that which was considered “nominal”, the surgeon may be able to compensate for the slight radial offset by rotating the wrist bearing component 56 relative to the carpal implant 54 in an equivalent manner.

The alignment mechanism 150 may permit the wrist bearing component 56 to be rotated in an infinite number of positions relative to the carpal implant 54, as would the connection of the wrist bearing component 56 to the carpal implant 54 through the Morse taper connection of the proximal stem 82 and the blind tapered hole of the securing feature 124, or through adhesives, or recessed screws that extend through the wrist bearing component 56 and which engage the body 70 of the carpal implant 54 (not illustrated).

In the particular example provided, the alignment mechanism 150 permits the wrist bearing component 56 to be rotated into one of a plurality of predetermined orientations 152. In this regard, the alignment mechanism 150 is illustrated to include a coupling member 154, which is coupled to the carpal implant 54, and a plurality of holes 156 that are formed into the wrist bearing component 56. Each of the holes 156 is sized to receive the coupling member 154 and is defined by a centerline 158 that is spaced circumferentially apart from the centerline 158 of an adjacent hole 156. Rotation of the wrist bearing component 56 relative to the carpal implant 54 is accomplished via engagement of the coupling member 154 into an associated one of the holes 156 that permits the wrist bearing component 56 to be placed in the installation orientation relative to the radial implant 52. Those skilled in the art will understand that the coupling member 154 may be removably coupled to the carpal implant 54 so as to provide the surgeon with an option not to use the coupling member 154 should the surgeon need more flexibility in positioning the wrist bearing component 56 relative to the carpal implant 54. Those skilled in the art will also understand that the coupling member 154 and the holes 156 may be reversed (i.e., the coupling member 154 may be attached to the wrist bearing component 56 and the holes 156 may be formed in the carpal implant 54).

In another preferred form, the present invention provides a method for implanting a prosthetic wrist 50 between the radius 2 and the portion 6 a of the carpal bone complex 6 of a patient. The method includes: providing a carpal implant 54 including a body 70, a ulnar flange 72 and a radial flange 74, the body 70 having a stem 80 that is arranged along an axis 86, the ulnar flange 72 being coupled to the body 70 and extending therefrom, the ulnar flange 72 having a lateral bone abutment surface 96, at least a portion of the lateral bone abutment surface 96 being skewed to the axis 86 of the stem 80 by an angle of less than 90 degrees, the radial flange 74 being coupled to the body and extending therefrom on a side opposite the ulnar flange 72, the radial flange 74 having a medial bone abutment surface 110, each of the ulnar and radial flanges 72 and 74 having a bone screw aperture 98 a, 98 b, respectively, formed therethrough; resectioning the carpal bone complex 6 along lines that are skewed to an axis of the capitate 20 and which correspond to the distal faces of the ulnar and radial flanges 72 and 74 and the interconnecting flange 84; forming an opening in the capitate 20 that lies along an axis that is generally coincident with the axis of the capitate 20; forming a pair of securing apertures 160 (FIG. 2) into the distal portion 6 a of the carpal bone complex 6, one of the pair of securing apertures 160 being formed in the hamate 22; securing the carpal implant 54 to the distal portion 6 a of the carpal bone complex 6 such that the stem 80 is at least partially disposed in the opening in the capitate 20 and engaged to the capitate 20; providing a first and second screws 58, the first and second screws 58 being appropriately sized to the pair of securing apertures 160 and the bone screw apertures 98 a, 98 b; placing the first screw through the bone screw aperture 98 a in the ulnar flange 72 and the securing aperture 160 in the hamate 22 and securing the first screw to the hamate 22 to bring the lateral bone abutment surface 96 into abutment with an ulnar side of a hamate 22; and placing the second screw 58 through the bone screw aperture 98 b in the radial flange 74 and the other securing aperture 160 in the distal portion 6 a of the carpal bone complex 6 and securing the second screw 58 to the distal portion 6 a of the carpal bone complex 6 to bring the medial bone abutment surface 110 into abutment with a radial side of the distal portion 6 a of the carpal bone complex 6.

Preferably, the method also includes: providing a wrist bearing component 56 having a wrist bearing surface 122 that is defined by a first radius 130 in the coronal plane and a second, different radius 132 in the sagittal plane; coupling the wrist bearing component 56 to a proximal stem 82 formed on the body 70 of the carpal implant 54 such that the wrist bearing component 56 is rotatable relative to the carpal implant 54; and fixing the wrist bearing component 56 to the proximal stem 82 such that the wrist bearing component 56 is aligned at a predetermined installation orientation relative to the distal portion 6 a of the carpal bone complex 6.

While the carpal implant 54 has been described thus far as being unitarily formed and used in conjunction with a discrete wrist bearing component 56, those skilled in the art will appreciate that the invention, in its broader aspects, may be constructed somewhat differently. For example, the carpal implant 54 a may be configured to include a discrete flange structure 200 and a discrete stem 80 a as illustrated in FIG. 8. The flange structure 200 is unitarily formed from a suitable material, such as CoCrMo, and includes a bone abutment surface 202. In the particular example provided, the bone abutment surface 202 is shown to include an interconnecting, lateral and medial bone abutment surfaces 90 a, 96 a and 110 a, respectively, which mimic the configurations of the interconnecting, lateral and medial bone abutment surfaces 90, 96, 110 (FIG. 3), respectively.

The stem 80 a is illustrated to include a tapered cylindrical portion 206, which is configured to be fitted to a hole that is formed in the capitate 20 (FIG. 2), and a connecting portion 210 for coupling the stem 80 a to the flange structure 200. The tapered cylindrical portion 206 is generally similar to the stem 80 (FIG. 3) discussed above and includes a porous coating 212. The coating 212 or surface may also be plasma sprayed or roughened to form an uneven or unsmooth surface and need not be porous.

In the example provided, the connecting portion 210 includes a threaded end portion 220, which is coupled to a proximal end of the tapered cylindrical portion 206, and a driving portion 224, which is coupled to an end of the tapered cylindrical portion 206 opposite the threaded end portion 220. The threaded end portion 220 is configured to extend through a stem receiving aperture 230 that is formed in the flange structure 200 and threadably engage a threaded aperture 232 that is formed in the wrist bearing component 56 a. The driving portion 224 is illustrated to include a geometric feature, such as a male hexagon shank 240, that permits the stem 80 a to be rotated with an appropriately configured tool 242 such that the threaded end portion 220 threadably engages the threaded aperture 232 in the wrist bearing component 56 a. Those skilled in the art will readily understand that the driving portion 224 may be of any shape (e.g., triangular, square, Torx®) and may extend from the tapered cylindrical portion 206 in the form of a shank, or be recessed into the tapered cylindrical portion 206, in which case the tool 242 would have a corresponding male end to engage the driving portion 224, rather than a corresponding female as illustrated in this example.

With the exception of the threaded aperture 232 and a pair of anti-rotation tabs 246, the wrist bearing component 56 a is otherwise identical to the wrist bearing component 56 of FIG. 2. The anti-rotation tabs 246 are configured to abut a proximal side of the flange structure 200 when the wrist bearing component 56 a is coupled to the carpal implant 54 a to thereby inhibit relative rotation between the wrist bearing component 56 a and the carpal implant 54 a. Those skilled in the art will appreciate, however, that other anti-rotation means may additionally or alternatively be incorporated into wrist bearing component 56 a and/or the carpal implant 54 a, including mating geometric features (e.g., a male hex protrusion formed onto the proximal side of the flange structure 200 and a mating hex recess formed into the distal side of the wrist bearing component 56 a), fasteners and pins. The use of anti-rotation tabs 246 provides the wrist bearing component 56 with a relatively greater range of motion as comparatively illustrated by the angles α and β.

The modular configuration described above provides the surgeon with a relatively high degree of flexibility when differently sized components are available in a kit form as shown in FIG. 9. In the example illustrated, several wrist bearing components (i.e., wrist bearing components 56 a and 56 a′), several flanges (i.e., flanges 200 and 200′) and several stems (i.e., stems 80 a and 80 a′) are provided in a kit 250. The wrist bearing components 56 a and 56 a′ are configured with an identical articular shape, but vary in their overall height dimension h. Similarly, the flanges 200 and 200′ and stems 80 a and 80 a′ are similarly configured, but vary proportionally to achieve a desired overall width, w, and/or length, l, for example.

In the embodiments of FIGS. 10 and 11, the carpal implants 54 b and 54 c are generally similar to the carpal implant 54 (FIG. 3), except for the configuration of the interconnecting, ulnar and radial flanges. In FIG. 10, the ulnar and radial flanges 72 b and 74 b, respectively, intersect one another and as such, this embodiment lacks the interconnecting flange 84 of the carpal implant 54. The ulnar flange 72 b is shown to be configured such that the lateral bone abutment surface 96 b is skewed to the stem axis 86 by an angle of about 30 degrees, while the radial flange 74 b is shown to be configured such that the medial bone abutment surface 110 b is skewed to the stem axis 86 by an angle of about 45 degrees. In FIG. 11, the interconnecting flange 84 c is configured such that the interconnecting bone abutment surface 90 c is arcuately shaped. In the particular example provided, the interconnecting bone abutment surface 90 c is tangent to the lateral and medial bone abutment surfaces 96 c and 110 c, respectively.

A further embodiment is illustrated in FIG. 12, wherein the carpal implant portion 54 d and the wrist bearing portion 56 d are unitarily formed from a suitable material, such as CoCrMo. In the particular embodiment illustrated, the carpal implant portion 54 d is illustrated to include ulnar and radial flanges 72 d and 74 d, respectively, that intersect one another in a manner that is similar to the ulnar and radial flanges 72 b and 74 b, respectively, of the carpal implant 54 b of FIG. 10. Those skilled in the art will appreciate, however, that the ulnar and radial flanges 72 d and 74 d may be formed differently so as to intersect at any desired angle, or such that they are spaced apart by an interconnecting portion in a manner that is similar, for example, to the configurations of the carpal implants 54 and 54 c of FIGS. 3 and 11, respectively.

A sixth embodiment is illustrated in FIGS. 13 and 14, and illustrates an alternately constructed radial implant 52 e, wherein the bearing guide 62 e is formed with an arcuate shape that is configured to matingly engage the curvilinear cut 300 of a resected radius 2 a′. Those skilled in the art will appreciate that the curvilinear cut 300 will support the bearing guide 62 e and thereby permit the radial implant 52 e to be formed with a relatively lower profile as compared to the radial implant 52.

A seventh embodiment is illustrated in FIG. 15, wherein the prosthetic wrist 50 f is illustrated to be generally similar to the prosthetic wrist illustrated in FIG. 8, except for the shape of the flange structure 200 f and the wrist bearing component 56 f. More specifically, the flange structure 200 f includes a generally V-shaped interconnecting flange 84 f to which the ulnar and radial flanges 72 f and 74 f, respectively, are oppositely coupled. As will be apparent to those skilled in the art, the wrist bearing component 56 f is contoured to matingly engage the proximal side of the flange structure 200 f and accordingly includes a generally V-shaped profile 400. In a manner that is similar to the prosthetic wrist of FIG. 8, the stem 80 f includes a threaded end portion 220 that is threadably received into a threaded aperture 232 that is formed in the wrist bearing component 56 f.

An eighth embodiment is illustrated in FIG. 16, which is similar to the prosthetic wrist of FIG. 8 except for the flange structure 200 g. The flange structure 200 g of the prosthetic wrist 50 g includes an interconnecting flange 84 g with an interconnecting bone abutment surface 90 g with a plurality of portions 500 that are each defined by a skew angle. The skew angles that define each portion 500 need not be symmetrical about the stem axis 86 g. The skew angle of each portion 500 is less than 90 degrees in magnitude to permit the interconnecting flange 84 g to conform and abut the proximal end of the distal portion 6 a (FIG. 2) of the carpal bone complex 6 (FIG. 2).

A ninth embodiment is illustrated in FIGS. 17 and 18. The flange structure 200 h is generally identical to the flange structure 200 g and as such, will not be discussed in further detail. The wrist bearing component 56 h is generally similar to the wrist bearing component 56 a (FIG. 8) in that the ulnar (lateral) and radial (medial) portions of the distal side of the wrist bearing component 56 h are angled to match the angled proximal surfaces of the ulnar and radial flanges 72 h and 74 h, respectively. However, the wrist bearing component 56 h also includes anterior and posterior located portions 600 on the distal sides of the wrist bearing component 56 h that extend distally in a manner that overlaps the flange structure 200 h. The configuration of the wrist bearing component 56 h therefore inhibits both relative rotation and relative anterior-posterior movement between the wrist bearing component 56 h and the flange structure 200 h.

A tenth embodiment, which is also similar to the prosthetic wrist 50 g, is illustrated in FIGS. 19 and 20. In this embodiment, the flange structure 200 i is similar to the flange structure 200 g except that the proximal side of the flange structure 200 i is parallel to the distal side of the flange structure 200 i (i.e., the proximal side of the flange structure 200 i includes a plurality of segments that are parallel to the segments that make up the distal side of the flange structure 200 i). As will be apparent to those skilled in the art, the wrist bearing component 56 i is contoured to matingly engage the proximal side of the flange structure 200 i and accordingly includes a profile 700 that matches the four angled surfaces that make up the proximal side of the flange structure 200 i.

An eleventh embodiment is illustrated in FIGS. 21 and 22, wherein the prosthetic wrist 50 j is illustrated to include a flange structure 200 j and a wrist bearing component 56 j. The flange structure 200 j is generally identical to the flange structure 200 i and as such, will not be discussed in further detail. The wrist bearing component 56 j is similar to the wrist bearing component 56 i in that it includes a profile 700 j that matches the four angled surfaces that make up the proximal side of the flange structure 200 j. The wrist bearing component 56 j also includes anterior and posterior located portions 600 j on the distal sides of the wrist bearing component 56 j that extend distally in a manner that overlaps the flange structure 200 j. Moreover, the flange 200 j, may be any appropriate geometry to substantially compliment or match the carpal plate.

According to various embodiments, illustrated in FIGS. 21A and 22A, wherein the prosthetic wrist 50 ja is illustrated to include a flange structure 200 ja and a wrist bearing component 56 ja. The flange structure 200 ja is generally similar to the flange structure 200 i and as such, will not be discussed in further detail. Nevertheless, it will be understood that the prosthetic wrist 50 ja may include other features and variations. In addition, the flange 200 ja may include a proximal surface 201 ja that is a substantially smooth arc or radius, as discussed here.

The wrist bearing component 56 ja is similar to the wrist bearing component 56 i in that it includes a profile 700 ja that substantially matches or compliments the proximal side 201 ja of the flange structure 200 ja. The proximal side 201 ja of the flange structure 200 ja includes a substantially smooth radius or arc. That is the proximal side 201 ja may be defined as an arc rather than a plurality of angles. The profile 700 ja may include a substantially smooth radius or arc that compliments or matches the arc of the flange 200 ja. Therefore, the flange 200 ja and the bearing component 56 ja may substantially mate when assembled.

The wrist bearing component 56 ja also includes anterior and posterior located portions 600 ja on the distal sides of the wrist bearing component 56 ja that extend distally in a manner that overlaps the flange structure 200 ja. Moreover, the flange 200 ja, including the proximal side 201 ja, may be any appropriate geometry to substantially compliment or match the surface 700 ja of the bearing 56 ja.

A twelfth embodiment is illustrated in FIG. 23 and includes a flange structure 200 k and a wrist bearing component 56 k. The flange structure 200 k includes a distal surface that is configured generally identically to the distal surface of the flange structure 200 g. The proximal surface of the flange structure 200 k, however, is segregated into a plurality of zones 800 a, 800 b and 800 c. Zones 800 a and 800 c are generally parallel the ulnar and medial bone abutment surfaces 96 k and 110 k. Zone 800 b, which is coupled at its opposite ends to zones 800 a and 800 c, is defined by a radius that tangentially intersects zones 800 a and 800 c. The wrist bearing component 56 k includes a profile 700 k that matches the proximal surface of the flange structure 200 k.

In FIGS. 24 and 25, a thirteenth embodiment is illustrated to include a flange structure 200 m and a wrist bearing component 56 m. The distal side of the flange structure 200 m is configured in a manner that is generally identical to the distal side of the flange structure 200 k discussed above. The proximal side 900 of the flange structure 200 m, however, is defined by a spherical radius 902. In the particular embodiment illustrated, the spherical radius 902 is centered at a point that is disposed along the axis 904 of the connecting portion 210 m. Those skilled in the art will appreciate, however, that the center of the spherical radius 902 may be positioned otherwise. The wrist bearing component 56 m likewise includes a distal profile 700 m that matingly engages the proximal side 900 of the flange structure 200 m.

In FIGS. 26 and 27, a fourteenth embodiment is illustrated to include a flange structure 200 n and a wrist bearing component 56 n. The flange structure 200 n is generally similar to the flange structure 200 m, except that the proximal side 900 n is defined by a first radius 1002 in the coronal plane and a second radius 1004 in the sagittal plane. The wrist bearing component 56 n is likewise generally similar to the wrist bearing component 56 m, except that the distal profile 700 n of the wrist bearing component is configured with a first radius in the coronal plane and a second radius in the sagittal plane so as to matingly engage the proximal side 900 n of the flange structure 200 n.

While some embodiments have been illustrated to include a unitarily formed component, such as a unitarily formed carpal implant, and others have been illustrated to include a component assembly, such as a carpal implant assembly that includes a discretely formed stem and a discretely formed flange structure, those skilled in the art will appreciate that any unitarily formed component may be formed in the alternative utilizing a plurality of discretely formed components and that any embodiment that is shown to be formed using a plurality of discretely formed components may likewise be unitarily formed in the alternative.

With reference to FIG. 28, the carpal bone complex 6 includes a geometry that also angles or curves about a radius between a volar side 1000 and a dorsal side 1002. The angle is between the volar side 1000 and the dorsal side 1002 of the carpal complex 6. Generally the bones including the hamate 22, the triquetrum 12, the lunate 10, the scaphoid 8, and the trapezium 16 define the dorsal volar curvature or profile of the carpal complex 6. It may be selected to include the radius defined by the carpal complex 6 in a carpal implant. The carpal implant that includes the dorsal volar radius may allow for a substantially easier implantation of the carpal implant and allow for a more natural orientation of the bones of the carpal complex 6 after implantation of the carpal implant. It will be understood that although specific embodiments are illustrated for a carpal implant including the selected radius, that any carpal implant may include the selected radius to allow for a substantially natural implantation of the carpal implant relative to the carpal complex 6.

With reference to FIG. 29, a carpal implant 1010 may be provided that includes a first segment 1012, a second segment 1014, and a third segment 1016. Between the first segment 1012 and the second segment 1014 may be a first angle 1018. Between the second segment 1014 and the third segment 1016 may be a second angle 1020. The first angle 1018 and the second angle 1020 provide a radius about the volar side 1022 of the carpal implant 1010 that includes a radius away from the dorsal side 1024 of the carpal implant 1010. It will be understood that the geometry of the carpal implant 1010 may be included in any appropriate carpal implant, such as various embodiments discussed above and herein. Nevertheless, it will be understood that the geometry of the carpal implant 1010 is not limited to a particular embodiment but may be provided in the various embodiments.

The carpal implant 1010 may include various bores such as a first screw bore 1026 and a second screw bore 1028. In addition, a third bore 1030 may be provided for positioning the stem 80 (FIG. 3) that is to pass through the carpal implant 1010. Regardless, it will be understood that the carpal implant 1010 may be provided with a plurality of portions or included with any of the implants as described above, or herein, so that the first angle 1018 and the second angle 1020 are operable to provide the substantially natural volar radius or dorsal bow for a prosthetic.

With regard to FIG. 29, a carpal implant 1040 may include a member 1042 that extends between a first end 1044 and a second end 1046. The member 1042 may define a radius 1048. The radius 1048 may provide that the member 1042 includes a substantially constant radius or arch between the first end 1044 and the second end 1046. The arch or angle between the first end 1044 and the second end 1046 may be substantially similar to the arch or angle defined by the carpal implant 1010 except that the angle or arch of the carpal implant 1040 is substantially continuous.

The carpal implant 1040 may also include a plurality of portions. For example, the carpal implant may include a first screw bore 1050 and a second screw bore 1052. In addition, the carpal implant 1040 may include a post bore 1054 that is operable to receive a post, as described above.

Although the carpal implant 1010 may include a plurality of angles 1018, 1020, and the carpal implant 1040 may include a substantially continuous radius 1048, each may provide an angle or a bow that is substantially similar to the carpal complex 6. Therefore, the carpal implant 1010, 1040 may be implanted into an anatomy in a substantially natural manner. It will be understood, in addition, that the portions defining the selected bow or radius may be included in any appropriate carpal implant. For example, the carpal implant 54 may include the selected portions and angles that are substantially angled distally to allow for a formation about the carpal complex 6. The carpal implant 54 may also include the dorsal bow that may be defined by the angles 1018, 1020 or the radius 1048. Therefore, it will be understood that the carpal implant may include a plurality of features to allow it to be implanted into a selected anatomy.

In addition, it will be understood that the carpal implant may be substantially interoperatively bowed to achieve a selected angle or radius. Therefore, during a procedure, a user, such as a surgeon, may determine that a selected bow or radius is required and forms the implant to the selected radius. This may be done by cold working, hot working, bending or any appropriate manner to form the selected bow or angles. Alternatively, or in addition, the carpal implant may be substantially customized for a selected individual. Therefore, pre- or intraoperative measures may be taken of the patient's anatomy, including the dorsal or volar bow of the carpal complex 6 to allow for a formation of the selected carpal implant to substantially mimic that of the natural anatomy of the patient. This may allow for a more natural implantation of the carpal implant into the anatomy of the patient for a substantially more precise anatomical implantation.

With reference to FIG. 30, a carpal implant 1100 is provided. The carpal implant 1100 may include a carpal complex engaging side 1102 and a proximal side 1104. The carpal implant 1100 may include the carpal side 1102 that is generally similar to the above-described carpal implants. For example, the carpal engaging side 1102 may include a first or ulnar section 1106, a second section 1108, a third section 1110 (wherein the second section 1108 and the third section 1110 may define a body), and a fourth, ulnar, or augmented section 1112. The augmented section 1112 may differ from those described above and may be provided to replace a selected bone portion, such as the scaphoid 8 in the carpal complex 6. The augmented section 1112 may include an augmented or exterior surface 1114 that may substantially replace the articulating surface of the scaphoid 8 during a procedure. Moreover, the augmented portion 1112 may be substantially integral or modular. Therefore, the carpal implant 1100 may include a member operable to receive a selected augmented region 1112 for selection by a user.

The carpal implant 1100 may further include a screw fixation bore 1116 and a post bore 1118. The screw which may be used to pass through the screw bore 1116 and the post 80 (FIG. 3) may be similar to those described above. In addition a screw fixation bore 1117 may be formed in the augmented section 1112. This may allow a fixation screw, such as those discussed above, to be passed through the augmented section 1112 to engage a portion of the carpal complex 6. This may allow fixing of the carpal implant 1100 to the carpel complex 6 in an appropriate manner. In this way it may also be understood that the surface 1114 does not particularly articulate with a portion of the carpel complex 6 yet the augmented section 1112 is operable to fill a void in the carpal complex 6, such as due to the removal of a selected bone from the carpal complex 6. Nevertheless, the augmented section 1112 may be provided to replace a selected boney portion and the remaining boney portions of the carpal complex 6 may articulate therewith, as discussed herein. Although it will be understood that the carpal implant 1110 may be connected to the carpal complex 6 in any appropriate manner, as mentioned above such that that surface 1114 does not articulate with the carpal complex 6.

The proximal surface 1104 of the carpal implant 1100 may include a substantially continuous convex radius such that it may articulate with a radial implant or a portion of the radius. Alternatively, the carpal implant 1100 may be fixed to a bearing member, such as the bearing member 56, to articulate with the radial implant. The carpal implant 1110 may allow for articulation of various portions of the carpal complex 6 with the other portions of the complex 6 and the radius 2 to allow for substantial replacement of the natural articulation of the wrist.

With reference to FIG. 31, the carpal implant 1100 may be positioned in the carpal complex 6 such that the augmented region 1112 replaces the scaphoid bone 8. Therefore, the augmented region 1112 may be able to articulate with the trapezium bone 16 and the trapezoid bone 18. The augment region may also articulate with the capitate bone 20 as will be understood by one skilled in the art. Therefore, a screw, such as the screw 58, may be used to engage the hamate bone 22 and the carpal implant 1110 is allowed to articulate freely with the other boney portions of the complex 6. Nevertheless, the augmented region 1112 need not articulate with the carpel complex 6.

The resection of the carpal complex 6 may be similar to a resection otherwise required to implant a carpal implant except that the scaphoid 8 may be replaced with the augmented region 1112. The articulating surface 1114 may be defined in such a way that the augmented region 1112 is operable to articulate with the selected bony portions to substantially mimic the natural articulation in the wrist. This may be selected if the scaphoid bone 8 is substantially removed due to a resection procedure, an injury, or the like. Therefore, it is not necessary to fix the carpal implant 1110 to a bone portion through the augmented region 1112, but the other bone portions of the carpal complex 6 may simply articulate with the augment region 1112.

It will be understood that the carpal implant 1110 may include any appropriate augments to engage any selected portions of the carpal complex 6. Therefore, the augmented region 1112 may be provided to replace the scaphoid bone 8 or other articulating the selected portions of the scaphoid complex 6. Thus, any appropriate augmented region of the carpal implant 1110 may be provided.

In addition, other various embodiments may include various portions that provide for replacement of selected bone segments such as the augmented region 1112. Thus, the carpal implant 1110, according to various embodiments or in conjunction with various embodiments, may be provided to replace a selected or bony portion to allow for a substantially natural articulation within the carpal complex regardless of the condition of the carpal complex. The augmented region 1112 may also be provided to replace other boney portions, such as the lunate 10. Moreover, the carpal implant 1110, as mentioned above, may be substantially modular such that the augmented region 1112 may or may not be included. Moreover, the augmented region may be selected to replace a selected bone by selecting a particular module.

In addition, the post 86 may be provided in the carpal implant 1100 to engage the bone portion capitate bone 20 and also engage the selected bearing member 56. Nevertheless, as discussed above, the radius side 1104 of the carpal implant 1100 may substantially provide an articulating or bearing surface to articulate or bear with the radius 2 or the radial implant 52, or any appropriate radial implant. Nevertheless, the carpal implant 1110 may articulate both with the radial portion, such as the radius 2, the radial implant 52, or any appropriate radial implant, and may also articulate with selected portions of the carpal complex 6. Therefore, the carpal implant 1100 may include both the radial side articulating surface 1104 and the articulating surface 1114 substantially defined by the augmented region 1112. Regardless, the carpal implant 1100 may be provided to allow for replacement of selected bony portions, such as those bony portions that are substantially incapable of providing anatomical support or articulation, by use of the augmented region 1112. Again, such as discussed above, the region 1112 need not articulate with the carpal complex 6 but may fill a mass in the carpal complex 6.

With reference to FIG. 32, a distal radial implant 1200 is illustrated according to various embodiments. The distal radial implant 1200 may be provided as a substantially modular implant that includes a stem portion 1202 that is operable to be positioned relative to a selected portion of the radius 2, such as intramedullary. Affixed or interconnected with a selected portion of the stem portion 1202 is a distal radial segment 1204. The distal radial segment 1204 may be provided to engage the stem 1202 to provide a selected orientation, configuration, size and other considerations for the distal radial implant 1200. Furthermore, a distal radial bearing 1206 may be provided that may engage a selected portion of the distal radial segment 1204. As discussed herein, the bearing 1206 may be fixed to the distal radial segment 1204, may articulate with the distal radial segment 1204, or may be provided in any appropriate configuration. In addition, the bearing 1206 may be omitted, as a bearing extending from the carpal implant may articulate with the distal radial segment 1204. Alternatively, the bearing member 1206 may be omitted, as a carpal implant or portions of the carpal complex 6 may articulate directly with the distal radial portion 1204. Nevertheless, the modular distal radial implant 1202 may be provided in a manner allowing a user, such as a physician, to select a distal radial implant interoperatively to substantially match the anatomy of a patient.

With reference to FIG. 33, the stem 1202 includes a body portion 1208 and a neck or engaging portion 1210. The neck portion 1210 may include a connection area, such as a male connection post, to engage a respective female connecting area, discussed herein, in the distal radial segment 1204. For example, the stem connection 1210 may include a groove or detent 1212 that is operable to engage a deflectable member or portion of the distal radial segment 1204. Nevertheless, the connection member 1210 may be provided to allow for an interconnection of the stem 1202 with the distal radial component 1204.

The body portion 1208 of the stem 1202 may include a selected geometry. For example, the body portion 1208 may be substantially cylindrical or tapered/conical to allow for easy insertion of the stem 1202 into the radius 2. The body 1208, however, may include a selected geometry to substantially resist rotation of the distal radial implant 1200 after implantation. For example, various extensions or keys, such as fins or tabs 1214, may be provided that extend from an exterior of the body 1208 such that the fins 1214 may engage a selected portion of the bone. In addition, the body 1208 may include a selected irregular geometry or regular geometry that includes portions that may resist rotation. For example, the body 1208 may include a substantially square or rectangular cross-section, may define a substantially “I-beam” cross-section, an oval cross-section, a star cross-section, a cruciform cross-section, or any appropriate cross-section. Nevertheless, the body portion 1208 may be provided for allowing both substantially easy implantation of the modular distal radial implant 1200 and a mechanism to resist rotation of the distal radial implant 1200 after implantation thereof.

Furthermore, the stem 1202 may be provided in a plurality of dimensions, such as a diameter, length, curve radius, cross-section, and combinations thereof. For example, the stem portion 1202 may include a diameter or a cross-sectional size 1216, a length 1218, or any other selected dimensions that may be varied. Therefore, a kit 1600 (FIG. 44), or other appropriate selection may be provided such that one or more of the stems 1202 may be provided with one or more variations in the selected dimensions 1216, 1218. For example, in the kit 1600, a plurality of the stems 1202 may be provided or each of the stems 1202 include a slightly different length 1218 such as about 4 cm, about 6 cm, and about 8 cm. Therefore, during a procedure, such as an implantation of the distal radial implant 1200, a user, such as a physician, may select the appropriate length for the stem 1202.

With reference to FIGS. 34A and 34B, the distal radial segment 1204, according to various embodiments, is illustrated as the distal radial segment 1204 a. The distal radial segment 1204 a may include portions that are operable to engage the stem 1202. Nevertheless, the distal radial portion 1204 a may be formed according to various embodiments, including various embodiments exemplary illustrated herein, or combinations thereof.

The distal radial component 1204 a generally includes a body portion 1230 and a superior or articulating portion 1232. The body portion may be formed in any appropriate manner to engage a selected portion of the anatomy. The body 1230 may include selected dimensions such as a length 1234, a width 1236, a height 1238, and an arch or radius 1240. The various dimensions 1234, 1236, 1238, and 1240 may be varied for various applications. As discussed above, and in conjunction with the stem 1202, a plurality of the distal radial segments 1204 a each including a unique set of dimensions 1234-1240 may be provided. Each may be provided in a large inventory or in the kit 1600 (FIG. 44) for selection by a user substantially intraoperatively or preoperatively. Nevertheless, various sizes or configurations of the distal radial implants 1204 a may be provided to allow for a substantially customized fit with a selected patient.

The distal radial component may also include the articulating region or portion 1232 that may also include a plurality of selected dimensions. For example, the articulating region 1232 may include a length 1242 and a width 1244. The articulating region 1232 may also include an articulation depth 1246 that may vary depending upon a selected application. The articulation depth 1246 may generally be understood to be the deepest portion of the concave region 1248 that defines the articulating surface of the articulating region 1232. The uppermost portion of the height 1246 may be a point where the articulating surface stops or transforms into a lip 1252. Therefore, the upper portion 1250 of the articulating surface may extend to the edge of the articulating region 1232 or may stop intermediate thereof. Again the articulating region 1232 including the various dimensions 1242-1246 may be varied and unique for a plurality of the implants 1204 a. Therefore, again, the user may select the distal radial implant 1204 a according to selected requirements or dimensions of a patient.

The distal radial implant 1204 a may define a selected geometry of the body 1230. For example, the body may include a single or plurality of depressions 1254 for various reasons. For example, the depressions 1254 may assist in allowing for a fixation of the distal radial implant 1204 a to a selected portion of the anatomy. In addition, the body 1230 may be substantially smooth over the surface thereof or include other various selected geometries. Again a plurality of geometries may be selected for various uses during an implantation.

The articulating region 1232 may include the first lip 1252 and a second lip 1256. The lips 1252, 1256 may extend a distance beyond an edge of the body 1230. The lips 1252, 1256 may be dimensioned depending upon a selected portion of the anatomy or a selected patient.

Defined in the body 1230 is a female receiving or interconnection portion or depression 1260. The female interconnection 1260 may include a dimension that allows for substantial interconnection with the male interconnection 1210 of the stem 1202. The reception or interconnection portion 1260 may include a deformable member (such as a canted coil spring or screw or other mechanism) 1262, or screw which may engage the depression 1212 of the stem 1202. Therefore, the distal radial component 1204 a may be interconnected with the stem 1202 for an implantation. It will be understood, that the body 1230 may define a male connection and the stem define a female connection. Thus the interconnection may be performed in any appropriate manner and these are merely exemplary.

With reference to FIGS. 35A and 35B, a distal radial implant 1204 according to various embodiments of a distal radial implant 1204 b is illustrated. The distal radial implant 1204 b includes portions similar to the distal radial implant 1204 a and like numerals will be used to indicate like portions. The distal radial implant 1204 b includes a body portion 1270 and an articulation portion 1272. The body 1270 may be substantially similar to the body 1230 of the distal radial implant 1204 a. Nevertheless, the articulation region 1272 may include a projection or flat spot 1274. The flat spot 1274 may be viewed as a portion of the body 1270 but extends a distance substantially parallel to a base 1276 of the body 1270. The flat portion 1274 may substantially abut a distal portion of the radius 2 during and after implantation. Therefore, the flat portion 1274 may allow for a substantially stable interconnection with the radius 2 after the implantation. Alternatively, the flat portion 1274 may be provided for a further connection or fixation portion to engage the radius 2.

Nevertheless, the distal radial implant 1204 b may include the plurality of dimensions 1234, 1236, 1238, 1240, 1242, 1244, and 1246. As discussed above, the plurality of dimensions may be substantially unique and different among a plurality of the distal radial implants 1204 b for a modular interconnection and selection by a user. In addition, the flat portion 1274 may be provided on the distal radial implant 1204 b as one of a plurality of the distal radial implants 1204 that may be provided in an inventory or the kit 1600 for use by a user. Therefore, the distal radial implant 1204 b may be provided for forming a distal radial implant 1200 depending upon a selected patient.

With reference to FIGS. 36A and 36B, a distal radial implant 1204 according to various embodiments of a distal radial implant 1204 c is illustrated. The distal radial implant 1204 c may include portions that are similar to the portions of the distal radial implant 1204 a and like numerals are used to reference like portions of the distal radial implant 1204 c. In addition, it will be understood that the distal radial implant 1204 c may include portions that are selectable to be used with other various embodiments of the distal radial implant 1204 a and the distal radial implant 1204 c is merely exemplary.

The distal radial segment 1204 c includes a body 1280 that may be similar to the body 1230 of the distal radial implant 1204 a. Therefore, the body 1280 may also include the female engaging portion 1260 operable to engage a selected portion of the stem 1202. Nevertheless, as discussed above, the female engaging portion 1260 may be any appropriate size, configuration and the like. In addition, any appropriate portion may be provided to engage the stem 1202. In addition, the body 1280 may include selected portions, such as depressions, dimensions and the like that may be substantially different for a selected use or patient.

Extending distally from the body 1280 is the carpal engaging region or portion 1282. The carpal engaging region 1282 is formed to extend from the body 1280 to engage a selected portion of the carpal complex 6. The bones of the carpal complex 6 may be held within the carpel engaging portion 1282 so that the bones of the carpal complex 6 are operable to articulate in a generally natural manner but may be held relative to one another to allow for a fixation of the wrist relative to the distal portion of the radius. Essentially the holding portion 1282 may surround a selected number or volume of the carpal complex 6 to allow for retention of the natural boney portion after implantation of the distal radial segment 1204 c.

The distal radial segment 1204 c may be provided for a substantially hemi-arthroplasty where substantially only the distal portion of the radius 2 is replaced. The distal radial segment 1204 c may articulate with the carpal complex 6 to reduce the need for a carpal implant.

With reference to FIG. 37, the distal radial implant segment 1204 c may be implanted to substantially capture or surround selected portions of the carpal complex 6 such as the scaphoid 8, the lunate 10, the triquetrum 12, and the trapezium 14. Therefore, if any portions of these bones are resected or if the portions of the carpal complex 6 are left substantially whole, they may be enclosed within the carpal complex portion 1282 of the distal radial implant 1204 c It will be understood that the containing portion 1282 may be shaped and sized for any appropriate application and may include a selected geometry for holding or fixing a selected number of the bones of the carpal complex 6. Moreover, a bearing component may be fit or molded onto the container portion 1282 to allow for a substantially smooth articulation of the various bones of the carpal complex 6 relative to the distal radial implant segment 1204 c

Returning reference to FIGS. 36A and 36B, the distal radial implant segment 1204 c includes the carpal engaging section 1282 which may include a plurality of selected dimensions. For example, the carpal containing section 1282 may include a selected high or ulnar side 1284 and a radial side 1286. This may allow for the carpal engaging section 1282 to substantially mimic the natural shape of the distal radial portion and how it would engage the carpal complex 6. For example, the distal radial implant 1204 c may engage and hold the carpal complex bone 6 in a selected orientation and shape. Therefore, the high side 1284 may include high side height 1288 and a low side 1286 may include a low side height 1290. Furthermore, the carpal containing section 1282 may include a length 1292 and a width 1294. Therefore, the carpal containing section 1282 may include a plurality of dimensions 1288-1294 that may be selected and varied depending upon a particular patient or user. In addition, as discussed above, a plurality of the radial distal implants 1204 c may be provided in either an inventory or kit 1600 for selection during a procedure to allow for a substantial customization of the implant for a selected patient.

Nevertheless, the carpal containing selection 1282 may allow for holding a selected number of the carpal bones in the carpal complex 6 in a selected manner for a substantially natural articulation. The carpal containing section 1282 may hold portions of the carpal complex 6 in a manner such as to allow for an articulation of even a weakened or fractured carpal complex. In addition, the carpal containing section 1282 may be used when various portions of the anatomy may be resected, such as removal of the entire proximal row of the carpal complex 6. In addition, the carpal containing section 1282 may retain resected portions of the bone segments that form the proximal row of the carpal complex 6 and may allow for collecting the portions of the carpal complex in such a manner to allow for articulation of the carpal complex 6 relative to the radius 2 by way of the distal radius segment 1204 c.

With reference to FIGS. 38A and 38B, a distal radial implant 1204 according to a various embodiment of a distal radial implant 1204 d is illustrated. The distal radial implant 1204 d may include portions similar to the distal radial implant 1204 a and like numerals are used to indicate like portions.

The distal radial implant 1204 d may be similar to the distal radial implant 1204 c in that both may be used for a substantially hemi-arthroplasty of the wrist including a resurfacing or arthroplasty of substantially only the radius bone 2 or the distal radial portion. Therefore, the distal radial segment 1204 d may include a body 1290 that includes the female engaging portion 1260. The distal radial implant segment 1204 d may interconnect with the stem 1202 to allow for formation of a selected distal radial implant. In addition, the body portion 1290 may include selected detents and other formations to allow for an implantation of the distal radial implant 1204 d+into a selected anatomy.

Extending from the body portion 1290 is an articulating or carpal portion 1292. The carpal portion 1292 may include a ulnar or first side 1294 and a radial or second side 1296. Extending between the two sides 1294, 1296 is a surface, such as an articulation surface 1298. The articulation surface 1298 may be a substantially metal articulation surface that does not necessarily require a bearing, such as a polymer bearing. The articulating surface 1298 may be used to articulate with a selected portion of the carpal complex in a substantially hemi arthroplasty replacement. Therefore, the articulating surface 1298 may be substantially a metal, or any other appropriate material, including a plastic, ceramic, pyrocarbon (also referred to as pyrolytic carbon), portion such that the body 1290 and the articulating region 1292 may be formed as a substantially single portion.

The articulating region 1298 may be provided in such a manner to articulate with a selected portion of the carpal complex 6 in a way that allows for replacement of only the distal portion of the radius 2 without augmentation of the carpal complex 6. Therefore, particularly in selected situations such as a fracture, chip and the like of the radius 2, the distal radial implant 1204 d may be used to resurface the selected portion of the radius 2 without requiring a carpal implant.

The articulating region 1292 may include selected dimensions such as a height 1300, a length 1302, and a width 1304 that may be different or selected depending upon a use or patient. For example, a selected size of the carpal complex 6 may require a selected size of the articulating region 1298 to engage the carpal complex 6 in a selected manner. In this way, the articulating portion 1298 may articulate with the carpal complex 6 to allow for replacement of substantially only the distal portion of the radius 2 rather than a replacement of a portion of the carpal complex 6 and a carpal implant.

Although the articulating region 1298 may be a substantially metal or hard material, such as a ceramic or pyrocarbon, articulating region, it will be understood that the articulating region 1298 may also include a bearing. The bearing may include a polymer bearing, such as a bearing formed of a ultra-high molecular weight polyethylene or any other appropriate bearing portion. Alternatively, the bearing surface 1298 may simply be a highly polished surface which allows for substantially easy, smooth articulation of portions of the carpal complex 6 relative to the distal radial implant segment 1204 d. It will be understood, therefore, that the various distal radial implants 1204 may be used for a complete or hemi arthroplasty of the radius 2.

With reference to FIGS. 39A and 39B, a bearing component 1206 according to selected embodiments of a bearing component 1206 a is illustrated. The bearing 1206 a may be interconnected with a selected distal radial implant 1204 according to various embodiments. Therefore, it will be understood that the bearing portion 1206 a may be affixed to a selected one of the distal radial implants such as the distal radial implant 1204 a.

The bearing components 1206 a includes an articulation or carpal bearing side 1310 that defines a bearing surface 1312. The bearing component 1206 a also defines a distal radial bearing side 1314. The distal radial bearing side 1314 defines a distal radial bearing surface 1316. The distal radial bearing surface 1316 is provided to substantially seat within the bearing side 1232 of the distal radial implant 1204.

The bearing 1206 a may be substantially fixed to the distal radial component 1204 a in any appropriate manner. For example, the bearing 1206 a may be adhesively affixed, mechanical affixed, welded, otherwise bonded, or the like. For example, a selected deformable or engagable lip or edge 1318 may be provided to engage the lip 1252 and, 1256 of the distal radial implant 1204 a. Alternatively, various locking portions such as screws, bars, and the like may substantially interconnect the bearing components 1206 a with the distal radial components 1204 a. Therefore, the bearing components 1206 a may substantially be held relative to the distal radial component 1204 a allowing for a substantially stable base of articulation of the carpal complex 6 and portions of the wrist relative to the varying portion 1206 a and the distal radial implant 1204 a.

The articulating surface 1312 of the distal radial implant 1206 a may allow for articulation of selected portions of the distal carpal complex 6. The carpal complex 6 may be allowed to articulate within the articulating surface 1312 to allow for a natural articulation of the wrist relative to the implant 1200.

Alternatively, the articulating surface 1312 may be provided to articulate with a selected portion of the carpal implant according to various embodiments. For example, the carpal bearing member 56 may be provided to articulate within the articulating surface 1312 of the bearing member 1206 a. Therefore, a total wrist replacement may be provided that includes the carpal implant 54 and the carpal bearing implant 56. The carpal bearing implant 56 may include a substantially polymer or a substantially metallic surface. Nevertheless, it is generally selected to provide a metal on polymer bearing articulation such that the bearing member 1206 a may be formed of either a polymer or a metal portion.

Alternatively, a carpal implant such as the carpal implant 1100 may be provided. The articulating surface 1104 of the carpal implant 1100 may be allowed to articulate with the articulating surface 1312 of the bearing member 1206 a. Therefore, the carpal implant 1100 may be implanted relative to the carpal complex 6 and may then articulate with the bearing 1206 a. Therefore, no additional or separate bearing components may be necessary and the bearing 1206 a may divide the bearing portion between the carpal implant 1100 and a selected distal radial implant segment 1204.

As discussed above, the distal radial bearing 1206 a may be substantially molded to the distal radial implant segment 1204 to allow for a fixation of the bearing components relative to the distal radial segment 1204. Thus, the modular component may be provided to allow for a minimal amount of portions that are necessary to be implanted to form a substantially total wrist arthroplasty.

With reference to FIGS. 40A and 40B, a distal radial bearing member 1206 b which is a distal bearing member according to various embodiments of the distal radial bearing member 1206 is illustrated. The distal radial bearing member 1206 b may be provided with any of the selected distal radial implant segments 1204. According to various embodiments, the distal radial implant 1206 b may be interconnected with the distal radial implant 1204 b.

For example, the distal bearing implants 1206 b may be substantially molded or adhered to the distal radial implant 1204 b similar to the fixation of the distal radial bearing portion 1206 a. Therefore, various fixation mechanisms such as an adhesive, a screw, a locking bar and the like may be provided. For example, a substantial locking tab or projection 1350 may be provided to engage a rim or section 1272 of the distal radial implant 1204 b. The distal radial bearing member 1206 b also includes an articulation side 1352 that defines a bearing surface 1354. The bearing surface 1354 may articulate with a selected portion of the carpal complex 6 or a selected portion of a carpal implant.

As discussed above, the articulation surface 1354 may articulate with a bearing portion of a carpal implant 54 or any appropriate bearing portion of a selected various embodiment of a carpal implant. In addition, the articulation surface 1354 may articulate with an articulating surface 1104 of the carpal implant 1100, discussed above. Therefore, either the carpal implant 1100 alone may articulate with the bearing member 1206 b or a separate bearing portion, which is interconnected with a carpal implant, may articulate with the bearing surface 1354 of the bearing implant 1206 b.

In addition, the bearing portion 1206 b includes a flat or flat extending portion 1356 that extends proximally from the articulating side 1352. The flat portion 1356 may extend around the flat portion 1274 of the distal radial implant 1204 b. This may allow for providing a portion of the bearing member around a selected portion of the distal radial implant 1204 b for selected purposes. The extending or flat member 1356 may define a void 1358 which is operable to engage or receive a selected portion of the flat portion 1274 of the distal radial implant 1204 b.

The bearing portion 1206 according to various embodiments, including the exemplary embodiments, 1206 a and 1206 b, may include various dimensions, such as height 1360, a length, 1362 and a width 1364 or a plurality of dimensions. Therefore, the bearing component 1206 according to various embodiments may include a substantial plurality number of unique and selectable dimensions for various applications. Therefore, a user may select one of a plurality of the varying components 1206 to meet selected requirements of a particular patient. The user may select an implant from the kit 1600 (FIG. 44), an inventory or the like to provide an implant for the requirements of a selected patient.

Therefore, it will be understood that the modular distal radial implant 1200 may include a plurality of the stems 1202, a plurality of the distal radial segments 1204, and a plurality of the distal radial bearing components that may be selected and interconnected in various and selected manners. This allows for the distal radial implant 1200 to be provided as a substantially selectable implant for various particular patients and uses by a user, such as physician. The modular assembly may also allow for a substantial intraoperative selection of the implant for a particular patient by a physician or user. Thus, the implantation may proceed while allowing for a substantially intraoperative customization of the implant 1200 to the patient. In addition, the modular implant 1200 may be easily augmented or portions replaced during a revision procedure due to the modular nature of the implant 1200.

As briefly discussed above, it will be understood that various implants may be provided as substantially hemi-arthroplasty or total wrist replacement. For example, the carpal implants, such as the carpal implants 54 or the carpal implant 1100 may be provided to interconnect with selected portions of the carpal complex 6 to substantially articulate with a natural portion of the radius and ulna. Therefore, a hemi-arthroplasty of the wrist joint or the wrist area may be provided by only resurfacing or providing the carpal implant. As discussed above, the carpal implant may include a size to interconnect with a plurality of the bones of the carpal complex 6 or may also replace a selected portion of the bones of the carpal complex 6. Regardless, the carpal implant may be provided to articulate with a natural portion of the radius.

Likewise, the distal radial implant according to various embodiments may be provided to substantial articulate with a natural portion of the carpal complex, as discussed above and herein. Therefore, the distal radial implant may be provided to articulate with a selected carpal implant or articulate with selected portions of the carpal complex 6.

As discussed above, the various portions of the distal radial implant may include a substantially modular distal radial implant 1200. The distal radial implant 1200 may include a plurality of distal radial portions 1204 which may include a plurality of the distal radial implant segments 1206 from which may be chosen one to articulate with a natural portion of the carpal complex 6, a carpal implant, or a combination thereof. Therefore, in the kit 1600 or a supply, the selected implant may be chosen to include the distal radial implant portion 1200 that is operable to interconnect or articulate with a natural portion of the carpal complex 6 or the carpal prosthetic. It will be understood that this may be done substantially intraoperatively such that a user, such as a physician, is able to chose from the kit 1600 or selecting the portions that are required intraoperatively to allow for a substantial customization regarding the selected patient.

With reference to FIG. 41, a distal radial implant 1400 according to various embodiments is illustrated. The distal radial implant 1400 generally includes a stem 1402 and a distal radial segment 1404. It will be understood that the distal radial segment 1404 may be substantially modular from the stem 1402, such as the modular radial implant 1200. Therefore, the stem 1402 may be substantially similar to the stem 1202 and the distal radial portion 1404 similar to the distal radial portion 1204. Thus, the distal radial portion 1404 may be provided in the kit 1600 or supplied to be interconnected with a selected one of the stems 1202 for formation of the distal radial implant 1400. Regardless, it will be understood that the distal radial implant 1400 may be substantially provided as a single member for implantation and may also be included in the kit 1600 of modular portions.

The distal radial segment 1404 generally includes a body portion 1406 that is interconnected with the stem 1402. As discussed above, the body portion 1406 and the stem 1402 may be substantially formed as a single member such that the distal radial portion 1404 is not substantially separable from the stem 1402. Such a configuration may be selected for various reasons, such as strength, materials, and the like. Regardless, the distal radial portion 1404 may define an articulation region extending distally from the body 1406.

The articulating side 1408 may include a first articulating fossa or surface 1410 and a second articulating fossa or surface 1412. The first articulating surface 1410 may substantially replicate a scaphoid fossa for articulation with a scaphoid bone 8 after implantation. The second articulation surface 1412 may be designed to substantially articulate with the lunate bone 10 after implantation. Therefore, the articulating surface 1408 of the distal radial segment 1404 may be designed to substantially replicate the natural articulating surfaces of the radius 2. This may allow for a substantially natural articulation of the carpal complex 6 relative to the radius 2 after a hemi-arthroplasty regarding a resurfacing or replacement of the distal portion of the radius 2.

The articulating surface 1408 may include a bearing portion that is substantially fixed to the body 1406. Alternatively, the articulating surface 1406 may include the substantially identical material to the body 1406. For example, the body 1406 may be formed of a selected metal or metal alloy and the articulating surface 1408 may be provided as a substantially polished surface to allow for a selected articulation of the scaphoid 8 and the lunate 10 relative to the distal radial segment 1404.

The articulating surface 1408 may be defined substantially flat or straight across the articulating surface 1408. Although the articulating surface 1408 may include the depressions 1410 and 1412 to define the articulating surfaces, the articulating region 1408 may be substantially straight across its upper surface to as not to substantially hinder movement of the carpal complex. Therefore, the distal radial segment 1404 may include a height 1414, a selected length 1416, and a width 1418.

As discussed above, it will be understood that the various dimensions 1414-1418 may be substantially unique among a plurality of the distal radial segments 1404 for selection by a user substantially interoperatively or preoperatively. Regardless, this allows the user to substantially select the portion for the distal radial implant 1400, or a modular portion for the distal radial implant 1200 to substantially suit a selected patient. Therefore, the user may be able to select whether to provide a hemi-arthroplasty or complete wrist replacement during the operative procedure depending upon the state of the patient.

With reference to FIG. 42, a distal radial implant 1450 according to various embodiments is illustrated. The distal radial implant 1450 may include portions that are substantially similar to the distal radial implant 1400 and similar reference numerals are used to reference like portions. Therefore, the distal radial implant 1450 may include the stem 1402 and a distal radial segment 1404.

As discussed above, the stem 1402 may be substantially modular relative to the distal radial segment 1404 to provide for a modular implantation of the distal radial implant 1450. In addition, a plurality of the stems 1402 and the distal radial segments 1404 may be provided for selection by a user. Alternatively, a plurality of a fully integrated distal radial implant 1450 may be provided. Therefore, the stem 1402 may be substantially integral with the distal radial segment 1404 or may be provided separately therefrom for interconnection during an operative procedure.

The articulating region 1408 of the distal radial implant 1450 may include the first articulating portion 1410 and the second articulating portion 1412. The first articulating portion 1410 may be provided to articulate with the scaphoid 8. As discussed above, the second articulating portion 1412 may be provided to articulate with the lunate bone 10.

Depending upon a selected patient's anatomy, the ulnar side of the distal radial segment 1404 may also include a recess 1452 for articulation with the ulna 4. As will be understood by one skilled in the art, the radius 2 may articulate with the ulna 4 during an anatomical motion (such as pronation or supination) of the wrist or arm portion and this may become damaged. Therefore, during an operative procedure which may be required or replacement or a resurfacing of the distal radial portion, the preparation of the radius 2, such as a resection thereof, may require removing the articulating region of the radius 2 that would generally articulate with the ulna 4. Therefore, using the distal radial implant 1450, including the recess 1452, may substantially allow an articulation of the ulna with the implant 1450 connected to the radius 2, after implantation of the distal radial implant 1450, in a substantially natural manner. It will be understood that the recess 1452 may be provided with any selected embodiment or in various embodiments of the distal radial implant and the distal radial implant 1450 is merely exemplary. For example the recess 1452 can be added to the distal radial segment 1204 c (FIGS. 36A and 36B).

In addition, the distal radial implant 1450 may include a curve or curvilinear portion 1454 that may be provided to substantially engage or hold a selected portion of the carpal complex 6 in a selected location. The carpal complex 6, such as after a trauma, may be unstable and require additional stabilization or retainment in a selected anatomical orientation. Therefore, the curvilinear portion 1454 may be provided on the distal radial implant 1450 for holding the selected portion of the carpal complex 6 in a location. It will be understood, again, that the curvilinear portion 1454 may be provided on any selected implant for holding the carpal complex 6 in a selected location.

Therefore, it will be understood that the illustrated embodiments are merely exemplary and not intended to limit the scope of any exemplary embodiments. Regardless, providing an articulating surfaces 1410 and 1412 that allows for substantially natural articulation of the carpal complex 6 relative to the distal radial implant 1400, 1450 may be selected to include further restricting portions such as the curvilinear portion 1454. Similarly, a resection of the radius 2 may allow or be selected to use the recess 1452 to create an articulation region for the ulna.

With reference to FIG. 43, the distal radial implant 1450 is illustrated exemplary implanted into a selected anatomy. The stem 1402 is implanted into the radius 2 to provide a fixation of the distal radial implant 1450 relative to the radius 2. The distal radial segment 1404 is positioned at an end, such as the distal end of the radius 2 after preparing the radius 2 for the implantation. The curvilinear portion 1454 is provided to retain a selected portion of the anatomy, such as the scaphoid 8 relative to the distal radial implant 1450. The first fossa 1410 is positioned to articulate with the scaphoid 8 while the second fossa 1412 is positioned to articulate with the lunate 10. In addition, the depression 1452 is provided to allow an articulation of the distal portion of the ulna 4 with the distal radial implant 1450.

Therefore, the implantation of the distal radial implant of 1450 may provide for articulation relative to the substantial natural or anatomical carpal complex 6 rather than positioning a carpal implant relative to the carpal complex 6. It will be understood that the distal radial segment 1404 may also include a bearing portion such as a polymer portion that may articulate with the bony portions such as the scaphoid 8 and the lunate 10. Regardless, as discussed above, the articulating surfaces 1410, 1412 may be substantially polished metal portions to allow for a smooth articulation of the natural portions of the carpal complex 6.

Therefore, it will be understood that each of the exemplary embodiments may include portions that are substantially dissimilar from the selected exemplary embodiments and may include combinations of each of the various embodiments. Therefore, the exemplary embodiments are not intended to limit the scope of the following claims but merely are provided to exemplify the portions thereof. Therefore, with reference to FIG. 44, the kit 1600 or supply may include a plurality of the stem portion 1202 a, 1202 b that each include a selected unique dimension, such as a length 1208 a, 1208 b, respectively. Furthermore, the kit 1600 may provide a plurality of distal radial portions 1204 a, 1204 b, 1204 c to provide a distal radial portion according to any of the various embodiments. Also, the kit 1600 may provide a plurality of distal radial bearing members 1206 a, 1206 b that are operable to provide any of the various embodiments discussed above. The kit may be used by a user during procedure to select and assemble a distal radial implant that is substantial customized to a selected patient.

Furthermore, the kit 1600 may provide a plurality of the carpal implants, such as the carpal implant 54 according to various embodiments, or the carpal implant 1100 and the bearing 56 according to various embodiments for selection by a user. In this way, a user may select to provide a hemi-arthroplasty to provide a prosthesis relative to the carpal complex 6 alone or relative to the radius 2 alone. Alternatively, the user may select to provide a substantially total wrist replacement that will provide a distal radial implant and a carpal implant. While selecting either of the total wrist arthroplasty or the hemi-arthroplasty, the user may also select various portions that may be provided to allow for a customized implant relative to the patient. The selection may occur substantially intraoperative due to the kit which includes a plurality of members which may be assembled to form the selected prosthesis.

Accordingly, while the invention has been described in the specification and illustrated in the drawings with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention as defined in the claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this invention, but that the invention will include any embodiments falling within the foregoing description and the appended claims. 

1. A method of performing a procedure relative to a radius and a carpal complex, comprising: forming an incision relative to the wrist; determining an arthroplasty to be performed for the wrist arthroplasty; selecting a stem member; selecting a distal radial segment that includes a carpal engaging portion that defines a first recess and an ulnar engaging portion that defines a second recess that is distinct from the first recess; interconnecting the selected stem member and the selected distal radial segment; positioning the stem member within the radius; positioning a selected volume of the carpal complex directly within the first recess of the carpal engaging portion such that the distal radial segment is directly engaged with the carpal complex; positioning a selected portion of the natural ulna directly within the second recess of the ulnar engaging portion.
 2. The method of claim 1, wherein interconnecting the selected stem member and the selected distal radial segment further comprises: interconnecting a male connecting member of the selected stem member with a female connecting member of the selected distal radial segment.
 3. The method of claim 2, wherein interconnecting a male connecting member with a female connecting member includes threading an externally threaded male member into an internally threaded female bore defined by the distal radial segment.
 4. The method of claim 1, wherein selecting the distal radial segment includes selecting at least one of a height, a width, a depth, an articulating surface, a bone holding segment, or combinations thereof of the distal radial segment.
 5. The method of claim 4, further comprising: evaluating a plurality of the distal radial segments wherein each of the plurality of distal radial segments includes at least one of a different height, width, depth, articulating surface, configuration, ulna bearing segment, or combinations thereof; wherein each of the plurality of the distal radial segments is separately interconnected with the stem member.
 6. The method of claim 5, further comprising: resecting a portion of the radius; and selecting the distal radial segment to include a height to accommodate the resected portion of the radius.
 7. The method of claim 1, further comprising: allowing movement of the distal radial segment to articulate with all of the selected volume of the carpal complex within the carpal engaging portion and the ulna.
 8. The method of claim 1, wherein selecting a stem member includes selecting one stem member from a plurality of stem members each extending from a first end operable to be positioned within the radius and a second end defining a male attachment portion; wherein selecting a distal radial segment includes selecting a member extending from a first end defining the carpal engaging portion defining the first recess and a second end defining a female engagement portion; wherein interconnecting the selected stem member and the selected distal radial segment includes fixing together the selected stem member and the selected distal radial segment for positioning within the radius.
 9. The method of claim 1, wherein selecting a distal radial segment includes: selecting an exterior wall of the distal radial segment to be substantially rectangular; wherein the carpal engaging portion defining the first and second recesses within the distal radial segment includes defining the first and second recesses within the rectangular external walls.
 10. The method of claim 1 wherein the first recess has a carpal engaging surface defined by a radius taken from a first axis that extends substantially in the anterior/posterior direction.
 11. The method of claim 10 wherein the second recess has an ulnar engaging surface defined by a radius taken from a second axis that is non-intersecting with the first axis.
 12. The method of claim 11 wherein the second axis is substantially parallel to a longitudinal axis of the selected stem member.
 13. The method of claim 1 wherein the second axis extends substantially in the proximal/distal direction.
 14. The method of claim 1 wherein the first and second recesses intersect within the distal radial segment.
 15. A method of performing a procedure relative to a radius and a carpal complex, comprising: forming an incision relative to the wrist; determining an arthroplasty to be performed for the wrist arthroplasty; selecting a stem member from a plurality of stem members each including a stem connection region; selecting a distal radial segment from a plurality of distal radial segments, each of the plurality of distal radial segments including: a body portion to replace a portion of a radius resected during the determined arthroplasty, a carpal engaging portion extending from the body portion having a first and a second internal wall, the first internal wall defining a carpal receiving recess extending into the carpal engaging portion to receive at least a portion of the carpal complex, the second internal wall defining an ulnar receiving recess to receive at least a portion of an ulna, and a distal radial segment connection region; connecting the selected stem member and the selected distal radial segment by fixing together the stem connection region and the distal radial segment connection region; positioning the connected stem member into the radius; and positioning a selected volume of the carpal complex directly within the carpal receiving recess of the carpal engaging portion to capture and contact the selected volume of the carpal complex with the distal radial segment, including positioning the selected volume of the carpal complex within the recess defined within a substantially rectangular external wall defined by the carpal engaging portion and positioning a selected portion of the natural ulna directly within the ulnar receiving recess.
 16. The method of claim 15, wherein including a stem connection region includes providing a male connecting member; wherein including a distal radial segment connection region of the selected stem member includes providing a female connecting depression in the distal radial segment opposed to the carpal receiving recess.
 17. The method of claim 16, wherein connecting the selected stem member includes connecting a separate selected stem member and a separate selected distal radial segment after selecting a separate and distinct stem member and a separate and distinct distal radial segment.
 18. The method of claim 15, wherein selecting a distal radial segment from a plurality of distal radial segments includes: resecting a selected portion of the radius; determining an anatomically correct radius replacement portion based at least on the resected portion of the radius; and selecting a dimension of the body to replace the determined anatomically correct radius replacement portion.
 19. The method of claim 18, wherein determining an anatomically correct radius replacement portion includes: determining a length of the selected portion of the radius that is resected; and selecting a height of the body portion to substantially equal the length of the selected portion of the radius that is resected.
 20. The method of claim 19, further comprising: positioning an exterior surface of the body portion to contact the resected radius; wherein positioning the connected stem member into the radius includes positioning the stem member into an intramedullary canal of the radius.
 21. The method of claim 15 wherein the first internal wall has a carpal engaging surface defined by a radius taken from a first axis that extends substantially in the anterior/posterior direction.
 22. The method of claim 21 wherein the second internal wall has an ulnar engaging surface defined by a radius taken from a second axis that is non-intersecting with the first axis.
 23. The method of claim 22 wherein the second axis is substantially parallel to a longitudinal axis of the selected stem member.
 24. The method of claim 22 wherein the second axis extends substantially in the proximal/distal direction.
 25. The method of claim 15 wherein the first and second internal walls intersect within the distal radial segment.
 26. A method of performing a procedure relative to a radius and a carpal complex of a wrist, comprising: forming an incision relative to the wrist; providing a distal radial segment having a body that has a first internal wall that defines a first recess, and a second internal wall that defines a second recess, the first recess having a carpal engaging surface defined by a radius taken from a first axis that extends substantially in an anterior/posterior direction, the second recess having an ulnar engaging surface defined by a radius taken from a second axis that extends substantially in the proximal/distal direction; providing a stem member; interconnecting the stem member with the distal radial segment; positioning the stem member within the radius; positioning a selected volume of the carpal complex directly within the first recess such that the carpal complex engages the first internal wall; and positioning a selected portion of the natural ulna directly within the second recess such that the ulna engages the second internal wall. 